Patent US3303147A successfully refreshed from Google Patents.
US3303147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry powder for wallboard joint treatment
Assignee: National Gypsum Co
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Filing: 1963-01-15
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Granted: 1967-02-07
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Expires: 1983-01-15
Abstract
No abstract record available.
Inventors
- 👤 Howard S Elden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:39
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00474; C04B2111/00663; C04B2111/00672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A DRY POWDER COMPOSITION SUITABLE ON ADMIXTURE OF WATER FOR APPLICATION OVER AND CONCEALING OF GYPSUM WALLBOARD JOINT AREAS, COMPRISING ESSENTIALLY AS THE ACTIVE BINDING INGREDIENTS FROM ABOUT 40% TO 65% BY WEIGHT OF 100 MINUS 100 MESH CALCINED GYPSUM, AND ABOUT 4% TO 10% BY WEIGHT OF THE COMBINATION OF POLYVINYL ACETATE EMULSIFIABLE POWDER AND POLYVINYL ALCOHOL POWDER, WHICH SAID POLYVINYL ALCOHOL POWDER IS AT LEAST 85% HYDROLYZED, AND FROM ABOUT 23% TO 54% BY WEIGHT INERT FILLER POWDERS WHEREIN THE RATIO OF SAID POLYVINYL ACETATE POWDER TO SAID POLYVINYL ALCOHOL POWDER IS FROM ABOUT 3:1 TO 10:1.
Claim 2
Dependent Claim
99 words
A DRY POWDER COMPOSITION SUITABLE ON ADMIXTURE OF WATER FOR APPLICATION OVER AND CONCEALING OF GYPSUM WALLBOARD JOINT AREAS, COMPRISING ESSENTIALLY AS THE ACTIVE BINDING INGREDIENTS FROM ABOUT 40% TO 65% BY WEIGHT OF 100 MINUS 100 MESH CALCINED GYPSUM, AND ABOUT 4% TO 10% BY WEIGHT OF THE COMBINATION OF POLYVINYL ACETATE EMULSIFIABLE POWDER AND POLYVINYL ALCOHOL POWDER, WHICH SAID POLYVINYL ALCOHOL POWDER IS AT LEAST 85% HYDROLYZED, AND FROM ABOUT 23% TO 54% BY WEIGHT INERT FILLER POWDERS WHEREIN THE RATIO OF SAID POLYVINYL ACETATE POWDER TO SAID POLYVINYL ALCOHOL POWDER IS FROM ABOUT 3:1 TO 10:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |